Assigned Example

Here's an example of how an assigned ticket will display in email, nothing has changed from the default template.

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Unassigned Example

Here's an example of how an unassigned ticket will now display. Note that previously an unassigned ticket would have said "Assignee: " and now it says "Assignee: this_ticket_is_unassigned"

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Create Filter Rule

Either server-side or on an email client of the Admin who doesn't wish to receive the notifications, configure a rule that will match the text string "Assignee: this_ticket_is_unassigned" and delete the message.

Conclusion

Now have you a basic idea of how unwanted unassigned ticket notifications can be automatically deleted from a specific inbox. The concept is to include a string for pattern matching and then delete the email when matched.

The text string is definitely up to you, but take care to make it a string that would not normally occur in a ticket. The rule definition for deleting the message will depend on your environment and it would be prudent to add additional criteria to prevent false positives, such as applying only to messages from the Help Desk e-mail address.